"He's very happy I don't write songs about him," she said.
The pair seemed very satisfied with their relationship. DioGuardi said, "He's just so genuine and good and honest and supportive and not freaked out, not jealous, he doesn't compete with me. He's just so understanding and loving. I just smile when I think of him," she said, smiling as she spoke. "He's just the best."
The couple wed in July 2009, and these days they are renovating their home in Los Angeles.
DioGuardi credits her husband, and her experience with "American Idol," for giving her the confidence to overcome her stage fright and perform her own songs. DioGuardi said she's enjoying the performances, where she will play some of her well-known tracks.
"I tell the story of how they were written," she said.
Often she'll discuss certain obstacles they overcame in writing the song or perhaps some of the backstory on how the song came about. "And then I sing the song acoustically. And then there's a 15 minute Q&A period: 'Is Simon really that mean?' 'Does Randy really say "dawg" that much?' 'What's it like with Ellen?' she said, laughing.
"You know, that kind of stuff, it's really fun," she said.